Hi,
The Rifle Shoppe has several versions and The last time I ordered from them the parts arrived within 2 weeks. They have historically accurate versions whereas few or none of the ones that are usually available from Track or others have a lug on the bottom for the cross pin. With respect to the hook, my advice is if your barrel has a well fitted breech plug and tang, cut the tang into a hook rather than install a different hooked plug.
dave